Logging block



,635, '1 July 1927' w. H. DICKINSON 78 LOGGING BLOCK Filed March 5. 19252 Sheets-Sheet l INNS/V701? W/IWESS:

y 1927' w. H. DICKINSON LOGGING BLOCK Filed March 5. 1925 2 Sheets-Sheet2 Patented July 12, 1927.

, am-1- E'o..sTAT-Es WALTER nplcxinson.ororrnsrnn, rENnsYLvANIA,ASSIGNOR 'ro ummnnisrnnr. BLOCK CORPORATION, or CHESTER, rnn-nsxmmnm,.-.A CORPORATION or Janna.-

A E. Q

LOGGING BL'ooK.

I Application filedslwarch 5, '1925, "Serial m. 13,121.-

The object of myinvention is to provide a detachable rope'guide forsnatch blocks and'other types of logging-blocks,-which compriseessentially a housing enclosing a 5 freely rotatable grooved sheave, anda shackle,'the latter being openalole to allow a rope to be engaged withthe sheave'and closable to prevent the escape of the rope from theblock. "In logging operations, the strain or pull on the rope is oftenatfan angle to the direction of extension of the sheave and may even be"parallel to the sheaves axis. The space between the shackle and theperiphery of the sheave being necessarily a capacious one,'the "rope ispulled out of engagement with the sheave, and if the block is badlyiiggech'or if there is any obstacle to the free swinging. of the blockinto line with the rope, the latter pulls "on the side of the housing orslips up into-the shackle, so that the block not only fails to functionbut may be damaged or ruptured.

' This objection has hitherto been, overcome by providingthe housingwith an integral guard which extends nearly across the housing a shortdistance from the; periphery of,

the sheave. This construction, however, is objectionable in that acoupling between adthe guard and the periphery of the sheave. Thisnecessitates unfastening andthen opening the shackle, slipping thecoupling through the block and closing and re-fastening the shackle.This being impracticable, mostloggers use a changing line block andafterward, when lines. are changed ready to log, substitute a block-witha guard.

The object of my invention is to provide a separable guard which isreadily removable and insertable and when in place functions asefficiently asfan integral guard. "Such a block presents distinctadvantages over the blockprovided with an integral guard and moreoverhas a wider range of use, as it is adapted for use as a universal blockfor outhauling purposes as well as a changing line.

block for overhead skidders. When used in place of a block withan-integral guard, the

The invention is susceptible of different the t lrawi'ngs, in whichjacent sections of rope cannotslip between sheave.

fullest extent, the short arm of the guard guard may be readily removed.to allow a.

same function as'guard plate 9.

embodiments, several of w hich are shown in Fig. '1 is a side view of"part'of a snatch block containing one embodiment of invention.

Fig. 21s-a3n end 'view of Fig. 1. Fig. 3 1s view, similar to Fig. 1, ofanotherembodiment of my invention.

Fig. 4 is a view, similarto Figs. 1 and 3,

.of still another embodiment o'fmyinvention.

In Figs-land 2: a, I), represent the spaced apart side plates of thebo'dy or housing of the block, each side being provided with outs1de,we'bs -c. The sheave'd is positioned between the sides aandb and turnsinbearings therein. The shackle fispivoted' to one of the sides, b. Itsfreeend swings'down between projections -e, e onthe other sidea andis'secured in position by meansof a'pin 2' extending throughsaidprOjectionsand the free end of the shackle; all in accordance with-acommon construction; Y Y A guard 9, formed of a flat plate o-fsteel andbent into the sha-pe" of an L, i s removably alfixed to the-blockbyinsertingthe lon"ger arm of the L between the' upper edge of the sidea and *the rounded -movable end of the shackle f. Preferably-this armo fthe guard is long enough to extend entirely across the space between thesides of the block and b'etween the upper edge of the side 2) and thepivoted end of the shackle 7, so as to hold the rope r from slippingentirely away from the When the guard is insertedto its abuts againstthe side aof the block. A cotter p1n h, or similar retainer, is then inserted through webs 0 so as' to extend in front of the short arm of theguard, thereby preventing the guard from becoming disings, such as anotch or recess m, midway between webs 0, through which is inserted aheaded guard pin a, which performs the In Fig. 4, each side plate isprovided with 1. all

two holes outside webs 0, each hole in one side plate aligning with oneof the holes in the other side plate, and two headed guard pins 7) areinserted, these two pins performing the same function as guard plate 9or guard pin a.

A retainer, such as a cotter pin 0, should be provided, at the endsthereof opposite their heads, to hold the pins n and p from displacementfrom working position.

It is obvious that my :inventive conception may be embodied in othermechanical forms. I hat I claim is:

l. A pulley block having a shackle, a sheave rotatably mounted in thehousing ot the block, and a separable stationary rope guard independentof the block structure adapted to be inserted in the space between thesheave and the shackle while the block is under tension and which isreadily rcmovable from operative position while the block is undertension to allow the passage of a coupling through said space.

2. A pulle block having a shackle, a sheave rotatallly mounted in thehousing of the block, a separable stationary rope guard independent ofthe block structure adapted to be inserted in the space between thesheave and the shackle while the block is under tension and which isreadily removable from operative position while the block is undertension to allow the passage of a coupling through said space, and aretainer to hold the guard from accidental displace ment.

3. A pulley block comprising a housing having sides, a shackle pivotallyconnected to said sides, a sheave rotatably mounted in the housingbetween the sides, there being sufficient space between the sheave andshackle tor the passage of a coupling, there being guard receivingrecesses in the sides of the housing between the sheave and shackle, anda removable stationary rope guard secured in said recesses independentoi the block structure and arranged to be removed or inserted while theblock and rope on the sheave are under tension.

l. A pulley block comprising a housing fOl'lllQtl of side plates, atsheave rotatable between, and on an axis substantially at right anglesto the side plates, an arch-shaped shackle pivotally secured to one sideplate and adapted to swing toward the other side plate and form, withthe housing and sheave, a capacious space, means to secure the movableend of the shackle to the last named side plate, and a separable.L-shaped guard plate the longer leg of which is insertable between theupper edge of one side plate and one end of the shackle and movableacross said space relatively close to the edge of the sheave until itsend extends between the upper edge ol the other side plate and the otherend of the shackle and its shorter leg abuts against the outside oi thefirst side plate.

5. A pulley block in accordance with claim -l in which the housing isprovided with webs on the outside of the side plates, and a cotter pininsertable through said webs so as to extend outside the short leg ofthe L-shaped guard plate and hold it from displacement when positionedto act as a rope guard.

In testimony of which invention, I have hereunto set my hand, at MarcusHook, Pa., 1

on this 13th day of February, 1925.

\VALTER H. DICKINSON.

